Journal
JOURNAL OF CHROMATOGRAPHIC SCIENCE
Volume 50, Issue 10, Pages 885-892Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/chromsci/bms086
Keywords
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Funding
- National Natural Science Funds [81102883]
- Guangdong Province Natural Science Funds [S2011010005540]
- Outstanding Doctoral Thesis Funds [sybzzxm201045]
- 211 the National Programs of Development Fun for Fund for Colleges and Universities
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A simple, rapid and sensitive liquid chromatography tandem mass spectrometry method is presented for the simultaneous determination of oleanolic acid, p-coumaric acid, ferulic acid, kaemperol and quercetin in rat plasma. Glycyrrhetinic acid was used as an internal standard, and sample pretreatment consisted of a liquid liquid extraction. Chromatographic separation was achieved on a Gemini 110A C18 column (50 x 2.0 mm i.d., 5 mu m) by gradient elution with a mobile phase consisting of methanol, acetonitrile and 0.01% formic acid in water. Tandem mass spectrometric detection was conducted using multiple reaction monitoring under negative ionization mode. Calibration curves offered linear ranges of two orders of magnitude with r > 0.99. The method was validated in terms of matrix effect, intra-day and inter-day precision, accuracy, linearity, specificity and stability. The relative standard deviation of intra-day and inter-day variations ranged from 2.66 to 14.74% and 1.9 to 14.55%. No substantial endogenous interference from blank plasma was observed. The method has been successfully applied to a pharmacokinetic study of Oldenlandia diffusa extract after oral administration in rats.
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